Last change
on this file since 403 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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File size:
917 bytes
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1 | #include "libm.h"
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2 |
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3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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4 | long double modfl(long double x, long double *iptr)
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5 | {
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6 | double d;
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7 | long double r;
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8 |
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9 | r = modf(x, &d);
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10 | *iptr = d;
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11 | return r;
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12 | }
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13 | #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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14 |
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15 | static const long double toint = 1/LDBL_EPSILON;
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16 |
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17 | long double modfl(long double x, long double *iptr)
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18 | {
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19 | union ldshape u = {x};
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20 | int e = (u.i.se & 0x7fff) - 0x3fff;
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21 | int s = u.i.se >> 15;
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22 | long double absx;
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23 | long double y;
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24 |
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25 | /* no fractional part */
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26 | if (e >= LDBL_MANT_DIG-1) {
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27 | *iptr = x;
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28 | if (isnan(x))
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29 | return x;
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30 | return s ? -0.0 : 0.0;
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31 | }
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32 |
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33 | /* no integral part*/
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34 | if (e < 0) {
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35 | *iptr = s ? -0.0 : 0.0;
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36 | return x;
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37 | }
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38 |
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39 | /* raises spurious inexact */
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40 | absx = s ? -x : x;
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41 | y = absx + toint - toint - absx;
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42 | if (y == 0) {
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43 | *iptr = x;
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44 | return s ? -0.0 : 0.0;
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45 | }
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46 | if (y > 0)
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47 | y -= 1;
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48 | if (s)
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49 | y = -y;
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50 | *iptr = x + y;
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51 | return -y;
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52 | }
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53 | #endif
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